Consistency between Calculated and Tested Values of Critical Flutter Speed of Flat Box Girder

WU Bo; WANG Qi; LI Zhiguo; LIAO Haili

doi:10.3969/j.issn.0258-2724.2018.03.012

Volume 31 Issue 3

Jun. 2018

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Journal of Southwest Jiaotong University > 2018 > 53(3): 517-524.

JING Guoqing, HUANG Hongmei, CHANG Jinxiu, QIANG Weile. Analysis of Mechanical Characteristics of Degradation Railway Ballast by Direct Shear Test[J]. Journal of Southwest Jiaotong University, 2017, 30(6): 1055-1060. doi: 10.3969/j.issn.0258-2724.2017.06.003

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WU Bo, WANG Qi, LI Zhiguo, LIAO Haili. Consistency between Calculated and Tested Values of Critical Flutter Speed of Flat Box Girder[J]. Journal of Southwest Jiaotong University, 2018, 53(3): 517-524. doi: 10.3969/j.issn.0258-2724.2018.03.012

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Consistency between Calculated and Tested Values of Critical Flutter Speed of Flat Box Girder

doi: 10.3969/j.issn.0258-2724.2018.03.012

WU Bo^{1,2
,},
WANG Qi^{1,2
,
,},
LI Zhiguo^1,2,
LIAO Haili^1,2

Received Date: 26 Jun 2017
Publish Date: 25 Jun 2018

Abstract

Abstract

To obtain the precise flutter performance of a flat box girder, concordances between calculated values and tested values of critical flutter speed were studied, using sectional model wind tunnel testing combined with the calculation method of critical flutter speed. The flutter derivatives under different wind attacks of the box girder were obtained using forced vibration tests. The critical flutter speeds were then calculated using the bimodal coupled flutter analysis method. Finally, the critical flutter velocities were obtained via the sectional model tests under the same conditions. The results indicate that the differences between calculated and tested critical speeds in all cases are minor, and the percent errors are less than 5% when the attack angle is 0°. The differences between calculated and tested critical speeds are substantial when the attack angles are 3° and 5°, and the percent error can reach 10.4%. Based on a comparison of flutter factors derived from the calculation and the test, excluding the effect of nonlinear aerodynamic force and structural damping, it is conjectured that the differences may have been induced by variation in flutter derivatives caused by different coupled motions.
- flat box girder,
- critical flutter speed,
- attack angles,
- wind tunnel test,
- consistency

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References(17)

References

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Consistency between Calculated and Tested Values of Critical Flutter Speed of Flat Box Girder

doi: 10.3969/j.issn.0258-2724.2018.03.012